linux-kernel - Re: [PATCH V4 3/4] pmdomain: core: Fix debugfs node creation failure

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Message-ID: <ZxuixxBzQZUdIW1c@hovoldconsulting.com>
Date: Fri, 25 Oct 2024 15:53:11 +0200
From: Johan Hovold <johan@...nel.org>
To: Sibi Sankar <quic_sibis@...cinc.com>
Cc: sudeep.holla@....com, cristian.marussi@....com, ulf.hansson@...aro.org,
	jassisinghbrar@...il.com, dmitry.baryshkov@...aro.org,
	linux-kernel@...r.kernel.org, arm-scmi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
	konradybcio@...nel.org, linux-pm@...r.kernel.org,
	tstrudel@...gle.com, rafael@...nel.org,
	Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH V4 3/4] pmdomain: core: Fix debugfs node creation failure

On Wed, Oct 23, 2024 at 03:51:47PM +0530, Sibi Sankar wrote:
> The domain attributes returned by the perf protocol can end up
> reporting identical names across domains, resulting in debugfs
> node creation failure. Fix this failure by ensuring that pm domains
> get a unique name using ida in pm_genpd_init.
> 
> Logs: [X1E reports 'NCC' for all its scmi perf domains]
> debugfs: Directory 'NCC' with parent 'pm_genpd' already present!
> debugfs: Directory 'NCC' with parent 'pm_genpd' already present!
> 
> Reported-by: Johan Hovold <johan+linaro@...nel.org>
> Closes: https://lore.kernel.org/lkml/ZoQjAWse2YxwyRJv@hovoldconsulting.com/
> Fixes: 718072ceb211 ("PM: domains: create debugfs nodes when adding power domains")
> Suggested-by: Ulf Hansson <ulf.hansson@...aro.org>
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---
> 
> v3:
> * Update device names only when a name collision occurs [Dmitry/Ulf]
> * Drop Johan's T-b from "fix debugfs node creation failure"

Also seems to do the trick:

Tested-by: Johan Hovold <johan+linaro@...nel.org>

But perhaps you could consider starting enumerating the duplicate
domains from 2 (or 1) instead of 0?:

NCC_1                           on                              0
NCC_0                           on                              0
NCC                             on                              0

Johan